Drill-chuck



(No Model.) 2 Sheets-Sheet I.

N. E. AUSTIN.

v DRILL CHUCK. No. 448,490. v Patented Dec. 30, 18904 x V a I ZW INVENTOR Mk0); Z: fiaffin.

ATTORNEYS (No Model.) 2 Sheets8heet 2..

N. E. AUSTIN. DRILL CHUCK.

No. 443,490. Patented Der 30, 1 890.

INVENTOR I Mz nlz flaw??? ATTORNEYS UNITED STATES PATENT OFFICE.

NELSON E. AUSTIN, OF DANBURY, CONNECTICUT.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 443,490, dated December 30, 1890.

Application filed May 10,1890. Serial No. 351,804. (No model.)

To all whom it may concern.-

Be it known that I, NELSON E. AUSTIN, a citizen of the United States, residing at Danbury, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Drill-Chucks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has reference to chucks, but has especial pertinence to chucks which are used for holding the tapering shanks of drills.

The object of my invention is to provide a chuck the jaws whereof shall have extended contact with the shank of the drill and at the same time to allow for any variation in the taper of said shank.

In the accompanying drawings, Figure 1 is a vertical sectional elevation of my improvement; Fig. 2, a cross-section at the line a: a: of Fig. 1; Fig. 3, a detail bottom view of one of the jaws; Fig. 4:, a detail perspective of one of the jaws; Fig. 5, a horizontal sectional elevation of the head proper, the rear of the chuck being in plain elevation; and Fig. 6, a detail perspective of one of the jawoperating blocks.

Similar letters denote like parts in the several figures of the drawings.

A is the chuck-head, which is cast with an opening or recess B through the center. 0 are the vertical channels within the side walls of this opening, and D are ways formed in the top and bottom of said walls. E are blocks having flanged heads F, adapted to fit snugly within said ways, so as to slide freely therein. The inner faces G of said blocks are inclined downward from front to rear, thereby giving theblocks the shape of a wedge. From the faces G extend T-headed ribs H, thus providinginclinedfurrowsIbetween said faces and the T-heads. I have minutely described the preferred manner of making these furrows I; but it is only essential that the blocks should be provided with inclined ways for the purpose presently set forth.

J are the clamping-jaws,which are provided with straight grooves K, leading into inclined grooves L in their outer faces and have hubs M extending transversely across said faces, the inner ends of said hubs being of a general conical shape and overhanging the grooves K L at their junction, while the outer ends project beyond the sides of the jaws.

In assembling my improvement the T- headed ribs II are inserted through the grooves L, so that the inner ends of the hubs M will extend within the furrows I, and the blocks and jaws thus united are placed within the chuck-head in such manner that the outer ends of said hubs will extend within the vertical channels 0. A ring N is then slipped on the head and secured in any ordinary manner, as by screws 0, thus confining the blocks and jaws. Now it will be evident that when the blocks are forced forward the jaws will be closed, and on the reverse movement of said blocks the jaws will be opened. Again, it must be stated that the hubs are round in cross-section, and therefore the jaws have a free rocking movement within thelimits prescribed by the grooves K L. This rocking movement permits the jaws to adapt themselves to the incline of the drill-shank, while the wedge-like action of the blocks E binds said jaws firmly against said shank. The guiding of the jaws is of course effected by the vertical travel of the hubs M within the channels (3. The rear end of the chuckhead is threaded, and a sleeve P, threaded interiorly, is run on said end, said sleeve having at the forward end an annular shoulder Q.

R is a ring secured to the rear ends of the blocks and having a lip S, which extends immediately behind the shoulder Q, thus connecting said sleeve and blocks and at the same time permitting the free rotary move ment of the sleeve. This coupling of the sleeve and blocks may be accomplished in various ways, and I do not wish to be limited to the details shown and described, since it is only necessary that said blocks should be so connected to the sleeve that they may revolve freely and at the same time have no lengthwise movement independent of said blocks. The exterior of this sleeve P is of a polygonal shape in cross-section to afiord a convenient wrench-hold in operating said sleeve to close or open the jaws.

My improvement can readily be adapted for holding straightshanlc drills by simply male 3 ing the outer ends of the hubs M rectangular in cross-section, so as to fit closely to the side walls of the channels C.

Having thus fully described my invention, what I claim as new, and desire to secure by 1; Letters Patent, is-

1. In a drill-chuck the recessed head having horizontal ways and vertical channels in the walls of the recess, in combination with the blocks arranged to slide in said ways and having on their inner faces inclined furrows, and the jaws having grooves, as described, and provided with hubs which rest in their inner ends within said furrows and extend 1: at their outer ends into said channels, substantially as set forth.

2. In a drill-chuck, as described, the combination of the slidingblocks having inclined ways in the sides of their inner faces, with the jaws having hubs extending within said 1 ways, whereby a rocking movement is permitted to said jaws, substantially as set forth.

3. In a drill-chuck, the combinatiomwith the blocks adapted to slide within the head of the chuck and having inclined ways in the sides of their inner faces, of the jaws having straight and inclined grooves, as described, within which said faces fit, and provided with hubs which extend within said ways, substantially as shown and set forth.

-t. The con'ibination, with the rear ends of the blocks, of the operating-sleeve swivcled to said ends, substantially as set forth.

The combination of the chuck-head jthreaded at the rear end, the interiorlythreaded sleeve adapted to run on said end and having an annular shoulder at the forward end, the blocks capable of a sliding movement, and the ring secured to said blocks and having a lip which extends behind said shoulder, substantially as set forth.

(1. The combination of the head having reeess 13, ways I), and vertical channels (1,

. blocks E, adapted to slide within said ways and having inclined inner faces, from which project T-headed ribs II, and jaws J, having slight grooves K and inclined grooves L, and provided with hubs M, which at their inner ends overhang said grooves and at their outer ends extend beyond the sides of the jaws, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

' NELSON E. A'L'S"IN.

Witnesses:

.IABEZ Ansncnv, ALEXANDER 1'. (tonnes. 

